can confirm in 1.19.3 and 1.19.4
I recently started to create a datapack that adds a new subterranean procedural dungeon (I know, very original) but when I test it, the jigsaw blocks just don't work at all. I changed the jigsaws, the template pools and created a new world to test but the jigsaw keeps generating incorrectly. i am adding some screenshots along with the datapack and a world i used to test
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Can confirm in 1.20.2